Try this on the Wifi icon to see additional info. For the Sound icon, you can select the output/input device you want to use. Not all menubar apps support this, but the default ones usually do.

2. It's always useful to know a couple handy keyboard shortcuts.

To paste without style, press Shift+Control+Option+Cmd+V. I highly recommend you remap this if you plan to use this shortcut often.

You probably already know Cmd+Shift+4 to take screenshots of selected areas. Instead of dragging an area, if you hover the mouse over a window and then press spacebar, you will take a screenshot of that window. Super useful for writing documentation and blog posts.

In any Open/Save window, press Cmd+Shift+G and it will open a new windows where you can navigate your directories just using your keyboard. Tab completion here works too.

Press Cmd+D to duplicate a file.

If you quickly want to hide all windows except the current one, press Cmd+Option+H. This is a fast way to get rid of distractions so you can focus on just one app. I use this all the time as I'm about to write content.

When you have multiple windows open of the same program, press Cmd+` (on the left side of the 1 key) and you can cycle between windows.

3. Add empty spaces to your dock with this terminal command.

If you want to add those empty spaces / placeholders on your Dock, type this in terminal:

Add as many as you like. I like to group certain apps together (writing, coding, graphics) and then have those empty spaces separate those groups.

4. Open certain files with your preferred application.

I like to use my favorite text editor Sublime Text for every text file I open. However, by default Finder (or Path Finder) uses a builtin text editor I don't like. You can easily change this. In Finder, right click on any file, then select Get Info. In the new window, expand the "Open with" section (it's usually near the bottom). Select your favorite app and then make sure to click on "Change All". That's it!

You can use this for any file extension.

5. Free up memory with one simple command.

When your Mac is running slow, instead of rebooting try this terminal command: purge. Just type that in terminal, wait about 30 seconds and it will flush disk and memory caches. Now your Mac should run faster.